package xyz.hellothomas.jedi.admin.common.utils;

/**
 * @author Jason Song(song_s@ctrip.com)
 */
public class ByteUtil {
    private static final char[] HEX_CHARS = new char[]{
            '0', '1', '2', '3', '4', '5', '6', '7',
            '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};

    public static byte int3(final int x) {
        return (byte) (x >> 24);
    }

    public static byte int2(final int x) {
        return (byte) (x >> 16);
    }

    public static byte int1(final int x) {
        return (byte) (x >> 8);
    }

    public static byte int0(final int x) {
        return (byte) (x);
    }

    public static String toHexString(byte[] bytes) {
        char[] chars = new char[bytes.length * 2];
        int i = 0;
        for (byte b : bytes) {
            chars[i++] = HEX_CHARS[b >> 4 & 0xF];
            chars[i++] = HEX_CHARS[b & 0xF];
        }
        return new String(chars);
    }
}
